When Camilla arrived at the event she appeared to be wearing a mixture of both ladies’ outfits – opting for cream and navy.

Her navy coat featured cream-coloured embroidery on the front, and her hat featured both cream and navy.

She completed the look with an extravagant pearl necklace and pearl earrings.

It was Meghan Markle’s first official appearance with the Queen today.

There are around 2,000 people at the event, including Theresa May and ex-One Direction singer Liam Payne, who will perform.

In the Queen’s Commonwealth Day message, she will pay tribute to the diversity of the “family of nations”, which can “help to create a future that is fairer, more secure, more prosperous and sustainable”.

After the service, Harry and Meghan will attend a private reception for those involved, including leaders from the 53 member states.

The prince is set to take on an official leadership position in the Commonwealth next month. The role will formally begin at the Commonwealth heads of government meeting in London, which he will attend alongside the Queen.

Harry and Meghan made sure to mention the Commonwealth during their joint interview to mark their engagement in November, with Harry saying they looked forward to travelling to some of the member countries soon. “With lots of young people running around the Commonwealth, that’s where we’ll spend most of our time hopefully,” the prince said.

Meghan added she was looking forward to using her increased profile to make positive change, both in the UK and around the Commonwealth. “One of the first things we started talking about when we met was just the different things that we wanted to do in the world and how passionate we were about seeing change,” the former Suits actress said at the time.

“Being able to go around the Commonwealth I think is just just the beginning of that,” she added.